Sigh...Ok I will spell this out.

@Sharkboy9800 at 16 your already producing a ton of test naturally. You need to eat lots and lift hard. Currently, your body is making connections to your testicles, raising test, and surging that through your body. Steroids will shut this connection/process down. Think of it like a dirt road. If you don't maintain that road grass will grow over it and then all of a sudden. Where the hell is that road? The same thing can happen to your body at this stage. Let your body build strong roads inside itself, let it upgrade itself from dirt to tar. Once that has happened you can cycle more safely.

However, people younger than you have used/continue to use and are just fine. There is TONS of medical research backing this up. Doctors prescribe and cycle AAS with children every day. I do not recommend one way or the other. However, you must be smart.